Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 16

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Plant polyamines in abiotic stress responses

100%
Gupta K., Dey A., Gupta B.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 07
Significance of naturally occurring intracellular polyamines (PAs), such as spermine, spermidine, and putrescine, in relation to the mechanism and adaptation to combat abiotic stress has been well established in plants. Because of their polycationic nature at physiological pH, PAs bind strongly to negative charges in cellular components such as nucleic acids, proteins, and phospholipids. Accumulation of the three main PAs occurs under many types of abiotic stress, and modulation of their biosynthetic pathway confers tolerance to drought or salt stress. Maintaining crop yield under adverse environmental conditions is probably the major challenge faced by modern agriculture, where PAs can play important role. Over the last two decades, genetic, transcriptomic, proteomic, metabolomic, and phenomic approaches have unraveled many significant functions of different PAs in the regulation of plant abiotic stress tolerance. In recent years, much attention has also been devoted to the involvement of PAs in ameliorating different environmental stresses such as osmotic stress, drought, heat, chilling, high light intensity, heavy metals, mineral nutrient deficiency, pH variation, and UV irradiation. The present review discusses the various reports on the role of PAs in the abiotic stress of plants with a note on current research tendencies and future perspectives. Co-relating all these data into a signal network model will be an uphill task, and solving this will give a clearer picture of the intricate abiotic stress signalling network in the plant kingdom.
2

A digitized database of bark morphology for identification of common tree species and literature study of bark phytochemicals and therapeutic usage

100%
Biswas S., Gupta K., Talapatra S. N.
World Scientific News
|
2016
|
tom 42
3

Cell Profiler software: an easy screening tool for DNA damage estimation in fish erythrocytes from comet assay image

100%
Palit A., Talikdar P., Gupta K., Talapatra S. N.
World Scientific News
|
2016
|
tom 55
4

Spermidine-mediated in vitro phosphorylation of transcriptional regulator OSBZ8 by SNF1-type serine/threonine protein kinase SAPK4 homolog in indica rice

100%
Gupta B., Gupta K., Sengupta D. N.
Acta Physiologiae Plantarum
|
2012
|
tom 34
|
nr 4
Plants respond to abiotic stresses such as salinity, extreme temperature and drought by the activation of complex intracellular signaling cascades that regulate acclimatory biochemical and physiological changes. Protein kinases are major signal transduction factors that play a central role in mediating acclimation to environmental changes in eukaryotic organisms. It is well known that changes in abiotic conditions such as the concentration of ions, temperature and humidity lead to modulation of polyamine contents in plants. However, little is known about the relevant part these polyamines play in abiotic stress responses. Here, we address a specific role of spermidine during high salt stress by studying its interaction with OSPDK, a sucrose nonfermenting 1-related protein kinase2 (SnRK2)-type serine/threonine protein kinase SAPK4 homolog in indica rice. In this report, we demonstrate that spermidine mediates in vitro phosphorylation of OSBZ8, a bZIP class of ABRE-binding transcription factor, by OSPDK. Our results give a first-hand indication of the pivotal role played by polyamines in abiotic stress cell signaling in plants.
5

Spermidine and abscisic acid-mediated phosphorylation of a cytoplasmic protein from rice root in response to salinity stress

100%
Gupta K., Gupta B., Ghosh B., Sengupta D. N.
Acta Physiologiae Plantarum
|
2012
|
tom 34
|
nr 1
Importance of higher polyamines, spermidine, and spermine, in relation to the mechanism and adaptation to combat abiotic stress has been well established in cereals. Owing to their polycationic nature at physiological pH, polyamines bind strongly to negative charges in cellular components such as nucleic acids, various proteins, and phospholipids. To study the physiological role of polyamine during salinity stress, phosphorylation study was carried out in cytosolic soluble protein fraction isolated from the roots of salt tolerant (Nonabokra) and salt sensitive (M-1-48) rice cultivars treated with none (control), NaCl (150 mM, 16 h), spermidine (1 mM, 16 h) or with abscisic acid (100 µM, 16 h).A calcium independen auto regulatory 42 kDa protein kinase was found to phosphorylate myelin basic protein and casein but not histone. Interestingly, this was the only protein to be phosphorylated in root cytosolic fraction during NaCl/ abscisic acid/spermidine treatment indicating its importance in salinity mediated signal transduction. This is the first report of polyamine as well as abscisic acid induced protein kinase activity in rice root in response to salinity stress.
6

QSAR modeling for prediction of acute toxicity and mutagenicity in different test models by established common phytochemicals present in Phyllanthus niruri

100%
Dhar S., Gupta K., Talapatra S. N.
World Scientific News
|
2016
|
tom 37
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

To predict human Biomarker for the obesity using mouse homologous expression data at different theiler stages

100%
Kumar A., Puri R., Gupta K., Pal A.
International Letters of Natural Sciences
|
2015
|
tom 45
There are numerous genetic factors like MC4R (Melanocortin-4 receptor), POMC (Proopiomelanocortin), SIM1 (Single Minded Gene) etc. important in obesity, which can be used as biomarker. But more reliable diagnostic markers are the need for today, along with new therapeutic strategies that target specific molecules in the disease pathways. As in mouse and human genes, where mutations in one or both species are associated with some phenotypic characteristics as observed in human disease. In molecular mechanisms of development, differentiation, and disease gene expression data provide crucial insights. Up-regulation and down-regulation of selective genes can have major effects on diet-induced obesity, but there is little or no effect when animals are fed a low-fat diet. In present study we have studied the gene expression data of mouse at different theiler stages using GXD BioMart. The interacting partners and pathway of the genes that are already used as biomarker in mouse as well as in humans have been studied. A gene NPY1R (Neuropeptide Y1 receptor) was taken as common after STRING and KEGG results on the basis of biochemical pathways and interactions similar to MC4R. Our present work focuses on comparative genomics and proteomics analysis of NPY1R, which has led to identification of biomarker by comparing it with already known MC4R human and mouse biomarker. It has been concluded that both the proteins are structurally and functionally similar.
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Biomonitoring tool: morphological anomalies in Zygnema sp. of Ganga river bank

100%
Das K., Gupta K., Swarnakar S., Talapatra S. N.
International Letters of Natural Sciences
|
2015
|
tom 47
The present study aims to detect morphological abnormalities in Zygnema sp. because this test species have high adaptive capacity in unfavourable environmental stress. This alga is inhabited at the suburban bank of river Ganga, West Bengal, India. The study was done at experimental sites, downstream at Khardah near sewage water mixing area was compared with upstream control site Kalyani as no sewage water discharge. External and internal abnormal morphology such as undulating or wavy and extra outgrowth on cell wall, sometimes bending inwardly and outwardly as external deformities while internal anomalies such as pigment loss, nucleus was in circular, rectangular, oval and amoeboid shapes, also vacuolated and trilobed, broom like chloroplasts and central part of the thallas dried in between two segments. It was observed that this test species was surviving and well adapted with above mentioned deformities. The present preliminary study with Zygnema sp. can be utilized for in situ and ex situ indicator species for riverine biomonitoring. Further research may be relevant to know both tolerant and sensitive algae species inhabited at the river Ganga bank alongwith biochemical and genetic parameters. The present work is suggesting that other inhabiting algae and this adaptive test species can be used for bioremediation of pollutants.
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

QSAR modeling for acute toxicity prediction in rat by common painkiller drugs

100%
Roy J. S., Gupta K., Talapatra S. N.
International Letters of Natural Sciences
|
2016
|
tom 52
Painkiller drugs or analgesics are potent pain reliever chemical agents, which are commonly used in pain therapy. Mathematical modeling by QSAR (quantitative structure activity relationship) methods are well known practices to determine predictive toxicity in biota. Now-adays, an easy screening of chemicals, QSAR can be done by using several recommended softwares. The present study was carried out by using software namely T.E.S.T. (Toxicity estimation software tool) for rat oral LD50 (median lethal dose) predictive toxicity for common painkiller drugs. These painkiller drugs were selected as 35 compounds and tabulated on the basis characteristics of one non-narcotic viz. acetaminophen, twenty non-steroidal anti-inflammatory such as bromofenac, diclofenac, diflunsial, etodolac, fenoprofen, flurbiprofen, ibuprofen, indomethacin, ketoprofen, ketorolac, maclofenamate sodium, mefenamic acid, meloxicam, nabumetone, naproxen, oxaprozin, phenylbutazone, piroxicam, sulindac and tolmetin as well as fourteen narcotic viz. buprenorphine, butorphanol, codeine, hydrocodone, hydromorphone, levorphanol, meperidine, methadone, morphine, nalbuphine, oxycodone, pentazocine, dextropropoxyphene and tapentadol. The data were tabulated on experimental (bioassay) from ChemIDPlus and T.E.S.T. and predictive toxicity of 30 compounds out of 35 compounds by using T.E.S.T. The predictive data were found by T.E.S.T. that 20 and 10 compounds were very toxic and moderately toxic respectively but not extremely, super toxic and non-toxic in rat model after acute oral exposure. It is suggested to evaluate the predicted data further with other available recommended softwares with different test models like daphnia, fish etc. to know aquatic toxicity when these compounds may discharge into waterbodies.
10
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Biomonitoring of river Ganga bank by identifying mollusc species as an indicator

100%
Gupta K., Nandy A., Banerjee K., Talapatra S. N.
International Letters of Natural Sciences
|
2015
|
tom 37
The present study deals with biomonitoring to know mollusc species as an indicator. In the present study, presence, absence and abundance of particular gastropod and bivalve species were identified in the different banks of river Ganga. The study was carried out at two experimental sites, Sodepur (Exp-1) and Khardah (Exp-2), West Bengal, India as the area exhibits a major sewage water outfall in the river compared with upstream control site, Kalyani (Cont-1) and downstream control site, Batanagar (Cont-1). The present biomonitoring shows qualitatively and quantitatively that in experimental no mollusc species were observed near the wastewater discharge area into the bank of river Ganga at Khardah while both sites of the sewage discharge area into the bank of river Ganga at Sodepur particular gastropod Bellamya sp. were observed when compared to control area. The highest variety and total nos of gastropods and bivalves (280 nos) were recorded in the upstream at Kalyani and lowest variety and total nos of only gastropods (150 nos) were recorded in the downstream at Batanagar. The present biomonitoring work was a preliminary observation to know sensitive and tolerant or accumulator mollusc species in the bank of river Ganga from a stretch of Kalyani (upstream) to Batanagar (downstream) in between urban wastewater discharge area (Sodepur and Khardah). Further researches must be relevant in relation to biomarker assessment with the physico-chemical factors and stress tolerant detoxification mechanism of particular mollusc species.
11
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Text mining approach to analyse the relation between obesity and breast cancer data

100%
Kumar A., Thakur P., Gupta K., Pal A.
International Letters of Natural Sciences
|
2015
|
tom 44
Biomedical research needs to leverage and exploit large amount of information reported in scientific publication. Literature data collected from publications has to be managed to extract information, transforms into an understandable structure using text mining approaches. Text mining refers to the process of deriving high-quality information from text by finding relationships between entities which do not show direct associations. Therefore, as an example of this approach, we present the link between two diseases i.e. breast cancer and obesity.Obesity is known to be associated with cancer mortality, but little is known about the link between lifetime changes in BMI of obese person and cancer mortality in both males and females. In this article, literature data for obesity and breast cancer was obtained using PubMed database and then methodologies which employs groups of common genes and keywords with their frequency of occurrence in the data were used, aimed to establish relation between obesity and breast cancer visualized using Pi-charts and bar graphs. From the data analysis, we obtained 1 gene which showed the link between both the diseases and validated using statistical analysis and disease-connect web server. We also proposed 8 common higher frequency keywords which could be used for indexing while searching the literature for obesity and breast cancer in combination.
12
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

New insights into functional roles of nitric oxide in roots

88%
Gupta K., Igamberdiev A., Kruger N., Kaiser W., Ratcliffe G.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2013
|
tom 94
|
nr 2
13

Chromosome mapping of four novel mutants in bread wheat (Triticum aestivum L.)

88%
Agarwal P., Jaiswal V., Kumar S., Balyan H. S., Gupta K.
Acta Physiologiae Plantarum
|
2015
|
tom 37
|
nr 03
Induced mutants constitute an important resource for mapping and cloning of genes for specific traits. Five loci underlying four induced mutants in wheat were mapped using phenotypic data and simple sequence repeat (SSR) genotyping data collected on F2 and F3 populations. The four mutant traits included the following: (1) axillary branching, (2) early leaf senescence, (3) reduced plant height and (4) reduced number of nodes. The ‘axillary branching’ locus (Axb) was mapped near Xcfd152 at a distance of 7.5 cM on chromosome 3DS. The ‘early leaf senescence’ gene (els) was mapped on 2DL at a distance of 28.6 cM from the nearest marker Xgwm539. A wheat expressed sequence tag (EST) TaSAG1 representing a candidate for els gene for early leaf senescence was also identified. The ‘reduced plant height’ locus was mapped on chromosome 2BL close to Xwmc361, which is tightly linked with Xwmc317 associated with a ‘GA-responsive dwarfing gene’ Rht4; hence, the ‘dwarf mutant-3’ used in the present study may be a phenotypic manifestation of an another allele of the gene Rht4. The ‘reduced number of node’ mutant was mapped on two loci (rnd1 and rnd2) on chromosomes 2DS and 5AL. The marker locus Xgwm261-2D linked with rnd1 was earlier reported to be closely associated with Rht8 gene, suggesting that rnd1 may perhaps represent a mutation in Rht8 gene; the second locus rnd2 on 5AL represents a novel gene. These results may prove useful in explaining the genetics of four mutant traits and may later also facilitate cloning the genes for these traits.
14
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The role of alternative oxidase in hypoxic metabolism of nitric oxide

88%
Igamberdiev A., Shah J., Cochrane D., Gupta K., Vanlerberghe G.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2013
|
tom 94
|
nr 2
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Trend of arsenic pollution and subsequent bioaccumulation in Oryza sativa and Corchorus capsularis in Bengal Delta

76%
Bhattacharya S., Guha G., Gupta K., Chattopadhyay D., Mukhopadhyay A., Ghosh U. C.
International Letters of Natural Sciences
|
2014
|
tom 16
Oryza sativa Linn. (rice) and Corchorus capsularis Linn. (jute) are the two major crops of the Bengal basin. Both rice and jute are generally grown in submerged flooded conditions, where arsenic bioavailability is high in soil. The consumers of the edible parts from both plants therefore face an inevitable source of exposure to arsenic, with consequent accumulation and toxicity. The objective of the study was to observe the in-vivo temporal variation of arsenic bioaccumulation in the different parts of O. sativa and C. capsularis. Rice plant specimens (Aman rice, Ratna variety) of different age groups (1, 2 and 3 months old) were analyzed in HG-AAS for absorbed arsenic content in different parts. The accumulation of arsenic remained significantly high in the initial phase of growth, but decreased with time. Amount of arsenic bioaccumulation followed the decreasing order: root > basal stem > median stem > apical stem > leaves > grains in all the three age groups of the rice plant samples. C. capsularis followed a trend of arsenic bioaccumulation similar to O. sativa. O. sativa had more accumulation potential than C. capsularis, but C. capsularis showed much higher efficiency of arsenic translocation in the above ground parts. This is the first ever report of time-dependent decrease in arsenic bioaccumulation in O. sativa and C. capsularis. The contamination level can reach the grain part in significant amount and can cause health hazards in more severely arsenic affected areas. Intensive investigation on a complete food chain is urgently needed in the arsenic contaminated zones for further risk assessments.
16

Heat-stress induced inhibition in growth and chlorosis in mungbean (Phaseolus aureus Roxb.) is partly mitigated by ascorbic acid application and is related to reduction in oxidative stress

64%
Kumar S., Kaur R., Kaur N., Kaur N., Bhandhari K., Kaushal N., Gupta K., Bains T. S., Nayyar H.
Acta Physiologiae Plantarum
|
2011
|
tom 33
|
nr 6
The rising temperatures (>35°C) are proving detrimental to summer-sown mungbean genotypes that experience inhibition of vegetative and reproductive growth. In the present study, the mungbean plants growing hydroponically at varying temperatures of 30/20°C (control), 35/25, 40/30, and 45/35°C (as day/night 12 h/12 h) with (50 µM) or without ascorbic acid (ASC) were investigated for effects on growth, membrane damage, chlorophyll loss, leaf water status, components of oxidative stress, and antioxidants. The ASC-treated plants showed significant improvement in germination and seedling growth especially at 40/30 and 45/35°C. The damage to membranes, loss of water, decrease in cellular respiration, and chlorophyll were significantly prevented by ASC treatment to plants growing at these temperatures. The oxidative stress measured as malondialdehyde and hydrogen peroxide content was observed to be significantly lower at high temperatures with ASC application. The activities of superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase increased at 40/30°C but decreased at 45/35°C in the absence of ASC while with its application, the activities of these enzymes were appreciably resorted. Among all the antioxidants, the endogenous ASC content decreased to the greatest extent at 45/35°C grown plants indicating its vital role in affecting the response of mungbean to heat stress. Exogenously applied ASC raised its endogenous content along with that of glutathione and proline at 45/35°C. The findings indicated that heat stress-induced inhibition in growth and chlorosis was associated with decrease in leaf water status and elevation of oxidative stress, which could partly be prevented by exogenous application of ASC. Its role in imparting protection against heat stress is discussed.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.